A clickwrap agreement (also known as a "clickthrough" agreement or clickwrap license) is a common type of agreement often used in connection with software licenses. Such forms of agreement are mostly found on the Internet, as part of the installation process of many software packages, or in other circumstances where agreement is sought using electronic media. The name "clickwrap" came from the use of "shrink wrap contracts" commonly used in boxed software purchases, which "contain a notice that by tearing open the shrinkwrap, the user assents to the software terms enclosed within".
The content and form of clickwrap agreements vary widely. Most clickwrap agreements require the end-user to manifest his or her assent by clicking an "ok" or "agree" button on a dialog box or pop-up window. A user indicates rejection by clicking cancel or closing the window. Upon rejection, the user cannot use or purchase the product or service. Classically, such a take-it-or-leave-it contract was described as a "contract of adhesion, which is a contract that lacks bargaining power, forcing one party to be favored over the other".
The terms of service or license do not always appear on the same webpage or window, but are always accessible before acceptance, such as through a hyperlink embedded in the product's webpage or a pop-up screen prior to installation. In order to be deemed to have accepted the terms of service, the purchaser must be put on notice that certain terms of service may apply. If the terms of service are not visible and/or accessible, courts have found the notice requirement to be lacking and as such, the purchaser may not be bound to the terms of the agreement.